[Beowulf] precise synchronization of system clocks

Lawrence Stewart larry.stewart at sicortex.com
Tue Sep 30 13:47:05 EDT 2008

On Sep 30, 2008, at 12:07 PM, Lux, James P wrote:

> On 9/30/08 8:37 AM, "Robert G. Brown" <rgb at phy.duke.edu> wrote:
> The grottiest grungy GPS receiver can probably do 100ns on its 1pps  
> tick,
> and most are in the 20ns range.  There ARE receivers that have  
> systematic
> errors (i.e. Some sort of sawtooth in the error) and, of course,  
> there are
> countless schemes to compensate in one way or another.

So someone with some grad students and soldering irons should hook up  
the 1 pps
output of a GPS to, say, the carrier detect pin on the unused RS232  
ports of all their
nodes, and write some software...


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